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Note 11 - Stock-Based Compensation (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Stock Issued During Period, Value, Issued for Services $ 100,000 $ 99,253    
Share-Based Payment Arrangement, Expense   $ 246   $ 804
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount $ 0   $ 0  
Share-Based Payment Arrangement, Nonemployee [Member]        
Stock Issued During Period, Value, Issued for Services     $ 100,000  
Share-Based Payment Arrangement, Option [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     3 years  
Share-Based Payment Arrangement, Option [Member] | Maximum [Member]        
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)     10 years